Calculating Transformer Load

Any understand how to properly calculate primary and secondary
overload protection.Or links to a know how.A little rusty in that
area at best.Thanks.

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Does anyone know of a 'buffer' they would add when sizing a transformer once they know their load demand and of course load volts? (load = secondary)

For example; calulated load would equal 46 kVA though instead of a 50kVA xfmr you'd install a 75kVA. Just curious if this sort of thing comes into play? Or does one just figure the amps of panel dictates the amps of the transformer?

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